Time: 1/9/15 11:57 PM
Description: Initializing game

java.lang.ArrayIndexOutOfBoundsException: -1
at com.darkona.adventurebackpack.util.calendar.ChineseCalendar.sectionalTerm(ChineseCalendar.java:334)
at com.darkona.adventurebackpack.util.calendar.ChineseCalendar.computeSolarTerms(ChineseCalendar.java:326)
at com.darkona.adventurebackpack.util.calendar.ChineseCalendar.isChineseNewYear(ChineseCalendar.java:60)
at com.darkona.adventurebackpack.AdventureBackpack.preInit(AdventureBackpack.java:74)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at cpw.mods.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:513)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at

Download latest version o.o

I did 1.7.10 from skydaz

it doesn't work
it crashes as soon as it loads

If you are downloading from an unofficial source there's no way you'll be sure to get an updated version. Go here and use the download link: https://github.com/Darkona/AdventureBackpack2/wiki

Skydaz even adds a link to the original thread, so you should have started there.